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1.服務(wù)端
package sterning;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.*;
import java.util.concurrent.*;

public class MultiThreadServer {
private int port=8821;
private ServerSocket serverSocket;
private ExecutorService executorService;//線程池
private final int POOL_SIZE=10;//單個CPU線程池大小

public MultiThreadServer() throws IOException{
serverSocket=new ServerSocket(port);
//Runtime的availableProcessor()方法返回當(dāng)前系統(tǒng)的CPU數(shù)目.
executorService=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors()*POOL_SIZE);
System.out.println("服務(wù)器啟動");
}

public void service(){
while(true){
Socket socket=null;
try {
//接收客戶連接,只要客戶進(jìn)行了連接,就會觸發(fā)accept();從而建立連接
socket=serverSocket.accept();
executorService.execute(new Handler(socket));

} catch (Exception e) {
e.printStackTrace();
}
}
}

public static void main(String[] args) throws IOException {
new MultiThreadServer().service();
}

}

class Handler implements Runnable{
private Socket socket;
public Handler(Socket socket){
this.socket=socket;
}
private PrintWriter getWriter(Socket socket) throws IOException{
OutputStream socketOut=socket.getOutputStream();
return new PrintWriter(socketOut,true);
}
private BufferedReader getReader(Socket socket) throws IOException{
InputStream socketIn=socket.getInputStream();
return new BufferedReader(new InputStreamReader(socketIn));
}
public String echo(String msg){
return "echo:"+msg;
}
public void run(){
try {
System.out.println("New connection accepted "+socket.getInetAddress()+":"+socket.getPort());
BufferedReader br=getReader(socket);
PrintWriter pw=getWriter(socket);
String msg=null;
while((msg=br.readLine())!=null){
System.out.println(msg);
pw.println(echo(msg));
if(msg.equals("bye"))
break;
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(socket!=null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
2.客戶端
package sterning;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class MultiThreadClient {

public static void main(String[] args) {
int numTasks = 10;

ExecutorService exec = Executors.newCachedThreadPool();

for (int i = 0; i < numTasks; i++) {
exec.execute(createTask(i));
}

}

// 定義一個簡單的任務(wù)
private static Runnable createTask(final int taskID) {
return new Runnable() {
private Socket socket = null;
private int port=8821;

public void run() {
System.out.println("Task " + taskID + ":start");
try {
socket = new Socket("localhost", port);
// 發(fā)送關(guān)閉命令
OutputStream socketOut = socket.getOutputStream();
socketOut.write("shutdown\r\n".getBytes());

// 接收服務(wù)器的反饋
BufferedReader br = new BufferedReader(
new InputStreamReader(socket.getInputStream()));
String msg = null;
while ((msg = br.readLine()) != null)
System.out.println(msg);
} catch (IOException e) {
e.printStackTrace();
}
}

};
}
}

做了一個最簡單的，不過自己感覺包含好多東西

Server端：
import java.io.DataInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server extends Thread {

public static void main(String[] args) throws IOException {
   boolean isStop = false;
   ServerSocket ss = null;
   try {
    ss = new ServerSocket(30000);
    while (!isStop) {
     Socket socket = ss.accept();
     PrintStream ps1 = new PrintStream(socket.getOutputStream());
     ps1.println("ok");
     ps1.flush();

     InputStream in = socket.getInputStream();
     DataInputStream dis = new DataInputStream(in);
     String head = dis.readUTF();
     Long length = dis.readLong();
     System.out.println(head);
     System.out.println(length);

     File file = new File("d:\\a\\1234567.txt");
     if (!file.exists()) {
      file.createNewFile();
     }
     try {
      FileOutputStream out = new FileOutputStream(file);
      byte[] buffer = new byte[1024 * 8];
      int len = -1;
      Long n = 0l;
      while ((len = dis.read(buffer)) != -1) {
       out.write(buffer, 0, len);
       n += len;
       if ((n + 1024 * 8) > length) {
        int lastLen = (int) (length - n);
        len = dis.read(buffer, 0, lastLen);
        out.write(buffer, 0, len);
        break;
       }
      }
     } catch (Exception e) {
      System.out.println("Error: " + e.getMessage());
     }

     String anotherhead = dis.readUTF();
     System.out.println(anotherhead);

     try {
      if (in != null)
       in.close();
     } catch (Exception e) {
     }
     socket.close();
    }
   } catch (Exception e) {
   }
}
}

Client端：
import java.net.*;
import java.io.*;
import java.util.*;

public class Client {
public static void main(String[] args) throws IOException {
   Socket s = new Socket("localhost", 30000);
   String flag = "";
   Scanner scan = new Scanner(s.getInputStream());
   if (scan.hasNextLine()) {
    flag = scan.nextLine().trim();
   }

   if ("ok".equals(flag)) {
  
    File file = new File("d:\\a\\a.txt");
    if (!file.exists() || !file.isFile()) {
     System.out.println("File \"" + args[2]
       + "\" does not exist or is not a normal file.");
     System.exit(0);
    }
  
    DataOutputStream out = new DataOutputStream(s.getOutputStream());
    out.writeUTF("aaaaaaaaaaaaaa");
    out.writeLong(file.length());
   
    FileInputStream in = null;
    try {
     in = new FileInputStream(file);

     byte[] buffer = new byte[1024 * 8];
     int len = -1;
     System.out.println("File tansfer statr...");
     while ((len = in.read(buffer)) != -1) {
      out.write(buffer, 0, len);
     }
     System.out.println("File tansfer complete...");
    } catch (Exception e) {
     System.out.println("Error: " + e.getMessage());
     System.exit(1);
    } finally {
     try {
      if (in != null)
       in.close();
     } catch (Exception e) {
     }
    }
  
    out.writeUTF("bbbbbbbbbb");
    if (out != null)
     out.close();
   }
   if (scan != null)
    scan.close();
   if (s != null)
    s.close();
}
}

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